Improved transparent fabric and process for producing same



Patented Dec. 31, 1935 UNITED STATES PATENT ol-"rlce' 'nurnovnn TRANSPARENT ran'nrc AND mocnss ron rnonucmc sam:

George Beberlein, Jr., Wattwil, Switzerland, as-

signor to Heberlein Patent Corporation, New, York, N. Y., a corporation of York N Drawing. Application January 14, 1932, Serial No. 586,712. In Germany September 14, 1931' 4Claims.

I This invention relates to an improved transparent fabric and to the process for producing such fabric. By transparentmaterial I mean to include material which is known in the trade *as "transparent, permanent organdie, and

glass batiste and similar fabrics. Such materials have been produced by various methods as 1 described for example in the following and other I United States patents: 1,144,655, 1,201,961, 1,288,885, 1,392,265, 1,439,512, to Georges Heberlein; patent to Eduard Heberlein 1,439,517, patentto Albert Bodmer 1,666,082; patent to Hein rich Forster 1,430,163; and patent to Oscar Klauser 1,258,225.

rents been found that fabrics of the mentioned undergo a change after manufacture, namely they assume the undesired characteristic of curling. This characteristic is noticeable for instance if ,one cuts a piece from such a fabric 2 and lays it flat. The edge of this cut piece will start to curl up in a directicn diagonal to the angles of the crossing threads. 1

The principalobject of the present invention accordingly is to produce a marketable product 25 free from the objection noted and a simple process for its production. The invention accordingly comprises the novel products as well as the novel processes and steps so of processes according to which such products are manufactured, the specific embodiments of which are described hereinafter by way of example and in accordance with-which I now prefer to practice the invention.

have been made to remove the internal strain in 40 the fabric which is believed to occasion the curl---' 4' ing, during that period. when the goods were first put on the market and that tendency to curl was recognized, I believed that it was due tov some of the conditions of treatment in the sul- 45 furlc acid bath and other swelling agents employed. I therefore carried out experiments varying the concentration, time and temperature factors involved in these treatments, but I was unable thereby to correct this tendency to curl; 50' It has now been found that this fault can be overcome if the fabric treated by a swelling agent, preferably a parchmentizing by sulfuric acid, to

- produce; the transparent effect is dried and pressed as by calendering toremove the internal 55 strainstending to make it curl. This discovery This tendencyto curl has been a characteristic .of such transparent goodsfor many yearsfand has always been recognized during that timess; an objectionable feature. Numerous attempts was unexpected." Transparent goods or permanent organdies are not ordinarily calendered. Calenderlng for the usual purposes where it is employed, viz. to produce a glossy smoothflnish was not required to be employed in preparing 6 these goods for the market and to use calendaring for the purposes which I herein employ it forywas resorted to by me not to produce the usual effects of such calendering, but to overcome this un- Y quality in the goods, namely'their tendency 10 I give'below embodiments of my invention.

'These embodiments are to be regarded as examples only, and it is to be understood that the invention is not restricted thereto:.

Example 1.-A mercerlzed muslin fabric is I parchmentized with sulfuric acid of 55' Be. in the usual manner; dried and finally passed through all of the jaws of a four roller calender under moderate pressure. The product after such treatment, in contradistinction to the untreated prodnot, shows substantially no tendency to roll when a piece of it is cut and laid flat.

Example 2.-A bleached previously mercerized cotton batiste is parchmentized with sulfuric acid of .53? Be. and thereafter mercerized once more, dried and finally passed through all five jaws ofa six-roll calender without special weighting of the rolls-and only under the weight of the calender rolls j themselves. The so-treated material shows's'ubstantially no tendency to roll up.

' Example 3.Bleached cotton batiste is impregnated with caustic soda of 32 36. at minus 8 C. for 1% minutes, washed, then mercerized under tension in normal manner. It is then washed and dried and treated with sulfuric acid 01 54 36.; it

is then washed and dried and passed through-all the jaws-of a four-roll calender underrmoderate weight. The so-treated product has become transparent and'the tendency to curl-therein has v beenremoved'.

E:cample,4.--.-Bleached cotton fabric is parchmentized with sulfuric acid of 56 B. and there after mercerized with caustic soda of 30.B.; it

is then washed and dried "and fina l passed 66 Example '.Bleached cotton fabric is impreg nated with caustic soda of 30 B. specific gravity at 10 Cels. for.2.mini1tes, washed, dried -and afterwards calendered with a three-roll calender under moderate pressure.

Example 6.A cotton fabric: is dipped in sulfuric acid having a gravity of 46 B for 2 'min'- utes, washed and dried and then subjected for v5 seconds to the treatment .of-sulfuric acid of 53.'---

B. Thereafter the fabric is washed and dried again and mercerized in the usual manner. with soda lye under tension. ,At last the iabric is calendered with a five-roll calender to get a noncurling transparent fabric.

The product as noted obtained by the" process?- of the above examples showsthe transparentef iectsdesiredwith' the tendency to curl substan- V tially eliminated. A It is tojbe understood that the invention may be applied not' only to all-over. effects, but also to pattern eil'ects. Itis recognized that in some instancespattern eflects may .be of a character such that theyfwould not occasion curling and in that case there would be.no necessity to apply the invention to prevent curling. 'In cases, how: everfwherethe pattern is of a character such that it tends to occasion curling, the process may be applied to eliminate such curl.

I claim: 1. A process for preparing non-curling transparent fabric which comprises treating cloth with a swelling agent to render it transparent and passing the cloththrough successive Jaws of a 5 calender having at least two Jaws, removing 'the tendency to curl from said fabric.

2. A process for preparing non-curling transparent fabric which comprises treating cloth with aswelling agent and a mercerization agent to render it transparent and passing it through at least two successive jaws of a calender to eliminate the strains therefrom. and to prevent the cloth from curling. I

3. A process for preparing non-curling transparent iab'ric which comprises treating cloth with sulfuric acid and mercerizing torender it transparentydrying the cloth and passing it under light pressure through several successive jaws between the rollsof a calender to eliminate the 20 strains from the fabric and to prevent the fabric from curling.

4. A transparent fabric prepared by treating cfabric with a swelling agent to render it transparent and then passing it through at least two 25 .jaws of a calender, said fabric having substantially no inner tensionin its fibres to causecurling and which, when out and laid flat, exhibits substantially no tendency to curl'up in a direction diagonal to the angles of the crossing threads orotherwise.

' GEORGE nnnnansm, Jumps.- 

